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ニュートリノ振動をめぐる理論的諸問題

Research Project

Project/Area Number 12047214
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionKyoto University

Principal Investigator

九後 太一  京都大学, 基礎物理学研究所, 教授 (00115833)

Co-Investigator(Kenkyū-buntansha) 前川 展祐  京都大学, 大学院・理学研究科, 助手 (40273429)
小林 達夫  京都大学, 大学院・理学研究科, 助手 (60322153)
川崎 雅裕  東京大学, 大学院・理学研究科, 教授 (50202031)
波場 直之  三重大学, 工学部, 助手 (00293803)
Project Period (FY) 2000 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥13,500,000 (Direct Cost: ¥13,500,000)
Fiscal Year 2003: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2002: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2001: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2000: ¥3,600,000 (Direct Cost: ¥3,600,000)
KeywordsMNS混合行列 / ニュートリノ / 異常U(1)電荷 / 宇宙背景放射 / インフレーション / E_6大統一理論 / ディラトン / Pseudo-南部-Goldstone粒子 / 大統一理論 / アフレック・ダイン機構 / レプトン非対称性 / 超対称性 / 湯川行列 / 異常U(1)ゲージ対称性 / 超対称性フレーバー問題 / ブレイン世界シナリオ / オービフォルド / Qボール / 超重力理論 / 質量階層構造 / インフレーション宇宙 / 元素合成 / ニュートリノ振動 / 世代構造
Research Abstract

今年度の研究実績は次の通りである。
九後は、二つの仮定1)クォーク・レプトンの質量行列が、異常U(1)電荷φ_iにより冪が与えられる因子化された形λ^{φ_i+φ_j}(Frogatt-Nielsen形)をとること、および2)このU(1)電荷φ_iがSU(5)GUTの構造を持つこと、を置くだけで、先ず、up型、down型クォークの質量データが必然的にレプトン側の牧-中川-坂田(MNS)混合行列U_{MNS}の大きな2-3混合を意味していることを示した。さらに太陽と大気ニュートリノの二乗質量差の比のデータをインプットすれば、1-2混合もまた必ず大きくなるということ、すなわちbi-large混合を導くことを示した。
川崎は、宇宙背景放射の精密観測(WMAP)の結果から導かれた宇宙のバリオン密度と宇宙の軽元素合成理論から導かれるバリオン密度が有意にずれていることを説明できるシナリオをレプトン数の非対称や元素合成後のバリオン数の増大等を導入することによって作った。さらに、それを具体的に実現するものとして超対称性理論におけるQボール生成に基づくモデルを提案した。
小林は、dilaton moduli場の素粒子の翼象論への重要な役割として、湯川結合の様々なmoduliへの依存性を計算した。そして4次元有効理論の結合の大きさを決める様々なdilaton moduli場の真空期待値の決定の機構を研究し、これらのmoduli場のインフレーション時での振舞いを調べた。
前川は、異常U(1)を用いた大統一理論の研究を継続し、E_6におけるdoublet-triplet splittingを実現するよりシンプルなモデルを提唱しただけでな、doublet-triblet splittingを実現するため昔提唱されたsliding singlet機構を一般化した。また、E_6大統一理論においては、レプトンセクターの混合角が一般的にクォークセクターの混合角よりも大きくなることを指摘し、その同じ構造がホリゾンタル対称性導入によるFCNCのsuppressionを自然に実現することを指摘した。また、ホリゾンタル対称性を持つE_6のヒッグズセクターを構築した。

Report

(4 results)
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (40 results)

All Other

All Publications (40 results)

  • [Publications] T.Kugo: "Higgs Doublets as Pseudo Nambu-Goldstone Bosons in Supersymmetric E_6 Unification"Proceedings of 2002 International Workshop on SCGT 02,(World Scientific, Singapole). 396-408 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Kasuya: "Affleck-Dine Mechanism with Negative Thermal Logarithmic Potential"Physcal Review D. 68巻. 023501-1-023501-15 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Fukugita: "The Earliest Epoch of Reionisation in the Standard Lambda CDM Model"Mon.Not.Roy.Astron.Soc.. 343巻. L25-L29 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Endo: "Cosmic String from D-term Inflation and Curvaton"Physics Letters B. 569巻. 73-80 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Kawasaki: "Inflation with a Running Spectral Index in Supergravity"Physcal Review D. 68巻. 023508-1-023508-10 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Kobayashi: "Heterotic Yukawa couplings and continuous Wilson lines"Physics Letters B. 566巻. 164-170 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Kobayashi: "Dilaton and Moduli Fields in D-term Inflation"Physcal Review D. 69巻. 023510 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Groot Nibbelink: "Localication of Heterotic Anomalies on Various Hyper Surfaces of $T^6/Z_4$"Physcal Review D. 69巻. 046001 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Nobuhiro Maekawa: "Non-Abelian Horizontal Symmetry and Anomalous U(1) Symmetry for the Supersymmetric Flavor Problem"Phys.Lett..

    • Related Report
      2003 Annual Research Report
  • [Publications] Nobuhiro Maekawa: "Simple E_6 Unification with Anomalous U(1)_A Symmetry"Prog.Theor.Phys.. 110巻. 93-105 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Nobuhiro Maekawa: "Flipped SO(10) Model"Physics Letters B. 567巻. 330-338 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Nobuhiro Maekawa: "Sliding Singlet Mechanism Revisited"Physcal Review D. 68巻. 055001 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Kugo: "Superconformal Tensor Calculus on an Orbifold in 5D"Progress of Theoretical Physics. 108巻1号. 203-228 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Kugo: "Gauge and Non-Gauge Tensor Multiplets in 5D Conformal Supergravity"Progress of Theoretical Physics. 108巻6号. 1143-1164 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Masako Bando: "Higgs Doublets as Pseudo Nambu-Goldstone Bosons in Supersymmetric E_6 Unification"Progress of Theoretical Physics. 109巻1号. 87-101 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Kawasaki: "A Supersymmetric Topological Inflation Model"Physical Review D. 65巻. 103518-1-103518-5 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Ichikawa: "Constraining the Variation of the Coupling Constants with Big Bang Nucleosynthesis"Physical Review D. 65巻. 123511-1-123511-7 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Kawasaki: "Large Lepton Asymmetry from Q Balls"Physical Review D. 66巻. 043516-1-043516-8 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Kobayashi: "Sfermion Mass Degeneracy, Superconformal Dynamics and Supersymmetric Grand Unified Theories"Physical Review D. 66巻. 095011-1-095011-11 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Kobayashi: "Yukawa Hierarchy Transfer Based on Superconformal Dynamics and Geometrical Realization in String Models"J. High Energy Phys. (JHEP). 0302. 022 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Abe: "Field Localization in Warped Gauge Theories"Physical Review D. 67巻. 045019-1-045019-14 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nobuhiro Maekawa: "Gauge Coupling Unification with Anomalous U(1)_A Gauge Symmetry"Progress of Theoretical Physics. 107巻3号. 597-619 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nobuhiro Maekawa: "E_6 Unification, Doublet-Triplet Splitting and Anomalous U(1)_A Symmetry"Progress of Theoretical Physics. 107巻6号. 1201-1233 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nobuhiro Maekawa: "Two-Loop Analysis of Gauge Coupling Unification with Anomalous U(1) Symmetry and Proton Decay"Progress of Theoretical Physics. 108巻4号. 719-735 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Tomoyuki Fujita: "Off-Shell Formulation of Supergravity on Orbifold"Progress of Theoretical Physics. 106巻3号. 671-690 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Kawasaki: "Vacuum Instability in Anomaly Mediation Models with Massive Neutrinos"Physical Review D. 63巻. 083510-1-083510-6 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Kawasaki: "Natural chaotic inflation in supergravity and leptogenesis"Physical Review D. 63巻. 103514-1-103514-8 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Kasuya: "Q-ball formation : Obstacle to Affleck-Dine baryogenesis in the gauge-mediated SUSY breaking?"Physical Review D. 64巻. 123515-1-123515-27 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] N.Haba: "Cosmological Constraint on the Zee model"Physics Letters B. 519巻3-4号. 243-248 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] N.Haba: "Model with Gauge Coupling Unification on S^1/( Z_2×Z_2') Orbifold"Progress of Theoretical Physics. 106巻6号. 1247-1254 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Naoyuki Haba: "Anarchy and Hierarchy : An approach to study models of fermion masses and mixings"Physical Review D. 63巻. 053010-1-053010-13 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Kobayashi: "Restricted flavor structure of soft SUSY breaking trilinear couplings"Physics Letters B. 506巻. 323-330 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Kobayashi: "Sfermion masses in Nelson-Strassler type of models : SUSY standard models coupled with SCFTs"Physical Review D. 64巻. 075003-1-075003-15 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Kobayashi: "Yukawa Hierarchy Transfer from Superconformal Sector and Degenerate Sfermion Masses"Physical Review D. 65巻. 015006-1-015006-6 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Bando: "Mass Matrices in E_6 Unification"Prog.Theor.Phys.. 104. 211-236 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Bando: "Novel Relations between lepton and Quark Mixings"Phys.Lett.. B483. 163-167 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Kawasaki: "MeV-Scale Reheating Temperature and Thermalization of Neutrino Background"Phys.Rev.. D62. 023506-1-18 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Kasuya: "A New Type of Stable Q-Balls in the Gange-Mediated SUSY Breaking"Phys.Rev.Lett.. 85. 2677-2680 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Haba: "Anarchy and Hierarchy"Phys.Rev.. D63. 053010-1-13 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Kobayashi: "Kaluza-Klein Mediated Supersymmetry Breaking"Phys.Rev.Lett.. 85. 5527-5530 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2018-03-28  

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